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sdcard.ino
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sdcard.ino
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#define debugPrint true
//https://stackoverflow.com/questions/2654480/writing-bmp-image-in-pure-c-c-without-other-libraries
//https://arduino.stackexchange.com/questions/79263/writing-a-1mb-bitmap-to-an-sdcard-with-only-96kb-ram
//https://medium.com/sysf/bits-to-bitmaps-a-simple-walkthrough-of-bmp-image-format-765dc6857393
void init_sdcard() {
// Initialise the SD library before the TFT so the chip select is defined
if (!SD.begin(SDCARD_SS_PIN)) {
Serial.println("Card Mount Failed");
return;
}
uint8_t cardType = SD.cardType();
if (cardType == CARD_NONE) {
Serial.println("No SD card attached");
return;
}
Serial.print("SD Card Type: ");
if (cardType == CARD_MMC) {
Serial.println("MMC");
} else if (cardType == CARD_SD) {
Serial.println("SDSC");
} else if (cardType == CARD_SDHC) {
Serial.println("SDHC");
} else {
Serial.println("UNKNOWN");
}
uint64_t cardSize = SD.cardSize() / (1024 * 1024);
Serial.printf("SD Card Size: %lluMB\n", cardSize);
//digitalWrite(SDCARD_SS_PIN, HIGH);
listDir(SD, "/MLX", 0);
}
void writeMLXImageToSDCard() {
init_sdcard();
char fn[30];
SD.mkdir("/MLX");
sprintf_P(fn,"/MLX/MLX-%i.bmp", fileCount );
if (SD.exists(fn)) {
Serial.printf("File %s exists, unable to write to SD card", fn);
return;
//SD.remove("/MLX/myBitmap.bmp");
}
myFile = SD.open(fn, FILE_WRITE);
if (myFile) {
myFile.write(header, sizeof(header));
// Write image data.
uint8_t row[rowSize];
lockTFT();
for (int y = 0; y < IMAGE_H; y++) {
for (int x = 0; x < IMAGE_W; x++) {
Pixel pix = getPixel(x, y);
row[3 * x + 0] = pix.b;
row[3 * x + 1] = pix.g;
row[3 * x + 2] = pix.r;
}
myFile.write(row, sizeof(row));
}
unlockTFT();
} else {
Serial.println("Error opening file on SD card for writing");
}
myFile.close();
bmpSaveScreenShot();
listDir(SD, "/MLX", 0);
SD.end();
/*
myFile = SD.open("/myBitmap.bmp");
if (myFile) {
Serial.println("content of the file:");
while (myFile.available()) {
Serial.write(myFile.read());
}
myFile.close();
} else {
Serial.println("error opening myBitmap.bmp");
}
*/
//pinMode(SDCARD_SS_PIN, OUTPUT ) ;
//digitalWrite(SDCARD_SS_PIN, HIGH);
//SPI.begin();
//tft.init();
//ESP.restart();
}
void listDir(fs::FS &fs, const char *dirname, uint8_t levels) {
//https://forum.arduino.cc/t/standard-c-regex-library-in-esp32/947306/2
//char sm[10];
//Reset file counts
fileCount = 0;
maxFileIndexNumber = 0;
Serial.printf("Listing directory: %s\n", dirname);
File root = fs.open(dirname);
if (!root) {
Serial.println("Failed to open directory");
return;
}
if (!root.isDirectory()) {
Serial.println("Not a directory");
return;
}
File file = root.openNextFile();
while (file) {
if (file.isDirectory()) {
Serial.print(" DIR : ");
Serial.println(file.name());
if (levels) {
listDir(fs, file.name(), levels - 1);
}
} else {
Serial.print(" FILE: ");
Serial.print(file.name());
Serial.print(" SIZE: ");
Serial.println(file.size());
fileCount++;
//Serial.println(regex_search(file.name(), sm, regex("^((false;|true;){7}(([0-1][0-9])|([2][0-3]));(([0-5][0-9])|([0][0])))$")));
}
file = root.openNextFile();
}
Serial.printf("File count = %i", fileCount);
}
Pixel getPixel(int x, int y) {
float t = frame[(IMAGE_H - y - 1) * 32 + (IMAGE_W - x - 1)]; //rotate 180 degrees
uint8_t r = (uint8_t)(getColor888(t).r);
uint8_t g = (uint8_t)(getColor888(t).g);
uint8_t b = (uint8_t)(getColor888(t).b);
return { r, g, b };
};
void bmpSaveScreenShot () {
//uint32_t filesize, offset;
uint16_t width = tft.width(), height = tft.height();
char filename[12] = "/image1.bmp";
//SD.begin();
while (SD.exists(filename)) { filename[5]++; }
bmpFile = SD.open(filename, FILE_WRITE);
// On error hang up
//if (!bmpFile) for (;;);
//
// File header: 14 bytes
bmpFile.write('B'); bmpFile.write('M');
writeFour(14+40+12+width*height*2); // File size in bytes
writeFour(0);
writeFour(14+40+12); // Offset to image data from start
//
// Image header: 40 bytes
writeFour(40); // Header size
writeFour(width); // Image width
writeFour(height); // Image height
writeTwo(1); // Planes
writeTwo(16); // Bits per pixel
writeFour(0); // Compression (none)
writeFour(0); // Image size (0 for uncompressed)
writeFour(0); // Preferred X resolution (ignore)
writeFour(0); // Preferred Y resolution (ignore)
writeFour(0); // Colour map entries (ignore)
writeFour(0); // Important colours (ignore)
//
// Colour masks: 12 bytes
writeFour(0b0000011111100000); // Green
writeFour(0b1111100000000000); // Red
writeFour(0b0000000000011111); // Blue
//
// Image data: width * height * 2 bytes
lockTFT();
for (int y=height-1; y>=0; y--) {
for (int x=0; x<width; x++) {
writeTwo(tft.readPixel(x,y)); // Each row must be a multiple of four bytes
}
}
unlockTFT();
// Close the file
bmpFile.close();
}
// Write two bytes, least significant byte first
void writeTwo (uint16_t word) {
bmpFile.write(word & 0xFF); bmpFile.write((word >> 8) & 0xFF);
}
// Write four bytes, least significant byte first
void writeFour (uint32_t word) {
bmpFile.write(word & 0xFF); bmpFile.write((word >> 8) & 0xFF);
bmpFile.write((word >> 16) & 0xFF); bmpFile.write((word >> 24) & 0xFF);
}